How to prioritize traffic for TCP port 9001?

I've read that pfSense 2.0 RC3 is now the recommended version of pfSense for new installs, so I plan on deploying a Netgate m1n1wall 2D3 running pfSense 2.0 RC3 soon. I've configured load balancing over 2 internet connections, and I want to prioritize traffic for a client/server application that uses TCP port 9001 over the internet. I'm having trouble figure this out, does anyone know the best way to do this?